ツバキ花粉の糖代謝とマルトースによる管伸長阻害

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Pollen tube growth of Camellia japonica is inhibited by exogenous maltose in contrast, for example, to that of Lilium longiflorum pollen which is promoted. On glucose medium, the tube growth of C. japonica is inhibited competitively by maltose, whereas on sucrose medium is not. Maltose may be involved in pollen tube growth without undergoing cleavage to glucose as pollen has no maltase activity. The present study focusses on the mechanism responsible for this unique inhibition of pollen tube growth by maltose. The effect of exogenous maltose on pollen tube growth in ca. 50 species from different families, representing both monocotyledons and dicotyledons, was examined. Results show that tube growth is inhibited only in pollen belonging to the Theaceae. Although it was not ascertained whether or not maltose was taken up into the pollen cytoplasm, the levels of intermediates related to glycolysis and sucrose metabolism were not affected by maltose, even when the pollen was incubated on a variety of sugar media in the presence or absence of maltose. Several glucosides, for example, phlorizin and salicin, inhibited pollen tube growth in C japonica in a similar way to maltose. These results suggest that inhibition of pollen tube growth is due to binding of maltose to the glucose transporter, which consequently inhibits the uptake of exogenous glucose, but not that of sucrose. It is also likely that the conversion of endogenous sugar into tube wall components is suppressed, although respiration is unaffected.
2006-12-31

ツバキ花粉の糖代謝とマルトースによる管伸長阻害

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